<div dir="ltr">One further thought on this - is it supposed to be so incredibly slow? Especially given it's basically only reprojecting from/to the same coordinate system (with a few decimal places of difference). I know that if I open things in different projections in ArcGIS there's no noticeable lag.<div>
Cheers,</div><div>Jonathan</div><div class="gmail_extra"><div><br></div>
<br><br><div class="gmail_quote">On 24 February 2014 13:58, Jonathan Moules <span dir="ltr"><<a href="mailto:jonathanmoules@warwickshire.gov.uk" target="_blank">jonathanmoules@warwickshire.gov.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Thanks for the responses. I think that's going to have to be the longer term plan.<span class="HOEnZb"><font color="#888888"><div>
<br></div></font></span><div><span class="HOEnZb"><font color="#888888">Jonathan</font></span><div><div class="h5"><br><div class="gmail_extra"><div><br></div>
<br><br><div class="gmail_quote">On 21 February 2014 18:46, Etienne Tourigny <span dir="ltr"><<a href="mailto:etourigny.dev@gmail.com" target="_blank">etourigny.dev@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">In this case you a probably better of making copies of the files with all the same CRS.</div><div class="gmail_extra"><br><br><div class="gmail_quote"><div><div>On Fri, Feb 21, 2014 at 11:41 AM, Jonathan Moules <span dir="ltr"><<a href="mailto:jonathanmoules@warwickshire.gov.uk" target="_blank">jonathanmoules@warwickshire.gov.uk</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr">Hi List,<div>Two issues,</div><div><br></div><div>First, I'm noticing that quite a few of the layers we have that are in British National Grid aren't actually treated that way when I load them into QGIS. This seems to be because they have a very slightly different definition than the one QGIS has.</div>
<div>For example:</div><div><br></div><div><div style="font-family:arial,sans-serif;font-size:13px">+proj=tmerc +lat_0=49 +lon_0=-2 +k=<a href="tel:0.9996012717" value="+559996012717" target="_blank">0.9996012717</a> +x_0=400000 +y_0=-100000 +ellps=airy +towgs84=375,-111,431,0,0,0,0 +units=m +no_defs<br>
</div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">+proj=tmerc +lat_0=49 +lon_0=-2 +k=<a href="tel:0.9996012717" value="+559996012717" target="_blank">0.9996012717</a> +x_0=400000 +y_0=-100000 +ellps=airy +towgs84=446.448,-125.157,542.06,0.1502,0.247,0.8421,-20.4894 +units=m +no_defs<br>
</div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">QGIS definition</div><div style="font-family:arial,sans-serif;font-size:13px">+proj=tmerc +lat_0=49 +lon_0=-2 +k=<a href="tel:0.9996012717" value="+559996012717" target="_blank">0.9996012717</a> +x_0=400000 +y_0=-100000 +ellps=airy +towgs84=446.448,-125.157,542.06,0.15,0.247,0.842,-20.489 +units=m +no_defs</div>
</div><div><br></div><div>Three different definitions for the same thing.</div><div>This becomes a problem because On The Fly reprojection (which I've now been forced to disable permanently) is super slow. Even a simple polygon layer with a few dozen features on top of a WMS creates a very noticeable (several seconds) lag.</div>
<div><br></div><div>So my question:<br>Is it possible to make QGIS recognise all the different definitions as one single definition?</div><div><br></div><div>Using a Master build from a couple of months ago.</div><div><br>
</div><div>Thanks,</div><div>Jonathan</div></div>
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